I recommend you to use windows 10 for that or linux. There should be no problem on windows 10 so you can give a try with it.
If I translate correct from the Electrum website correctly. Did it indicate that if I must use an older version than 3.0.6 that it would be ok, as long
as when I use it, that I am offline, and as long as I have some type of password associated with it???
Dont use the version older than 3.0.5. See this
thread for more info about older electrum version